[PATCH v2] mct_u232: sanity checking in probe

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An attack using the lack of sanity checking in probe
is known. This patch checks for the existance of a
second port.
CVE-2016-3136

Signed-off-by: Oliver Neukum <ONeukum@xxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx

v1 - add sanity check for presence of a second port
v2 - add sanity check for an interrupt endpoint
---
 drivers/usb/serial/mct_u232.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 4446b8d..3e64538 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -378,6 +378,10 @@ static int mct_u232_port_probe(struct usb_serial_port *port)
 {
 	struct mct_u232_private *priv;
 
+	/* check first to simplify error handling */
+	if (!port->serial->port[1] || !port->serial->port[1]->interrupt_in_urb)
+		return -ENODEV;
+
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.1.4

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